Interchanges

Museum of Dumb Highway Design - Aerial photos of and commentary on various interchanges which the author finds unusual or substandard.
http://www.weathergraphics.com/tim/dumbroad/

The Parallel Flow Intersection - A specialized intersection. Page includes diagrams and research.
http://www.quadranteng.com/

California Freeway Interchanges - Photographs from around the state.
http://members.cox.net/mkpl/interchange/interchange.html

Interstate Interchange Browser - Uses Google Maps to locate every interchange on the U.S. Interstate system.
http://www.m-plex.com/roads/cmap/int/

Unusual Interchanges - Diagrams and commentary of various ones in the East-Central U.S.
http://www.lostagain.net/unint/

Continuous Flow Intersections - Engineering firm page illustrating the connections in this feature. Includes illustrations and a video demonstration.
http://www.abmb.com/cfi.html

Interchange of the Week - Detailed entries for locations in New York State, using official state aerial photography.
http://www.empirestateroads.com/week/

Highway-Intersections.net - Compendium of map images from various European countries.
http://www.highway-intersections.net/

Interchanges - Page describing types found in the United Kingdom. Includes a link to the Bad Junctions page.
http://www.cbrd.co.uk/reference/interchanges/

An VRML rendering of the 15-91 interchange, Corona California. - A 4-level stack with one loop. Requires a VRML plugin to view.
http://interchange.tvheaven.com

Highway Feature of the Week - Large archive of maps and descriptions of unusual or complicated facilities, primarily in the United States.
http://www.gribblenation.com/hfotw/

US Highway Interchange Browser - Covers Michigan and North Carolina.
http://roadgeek.filpus.org/Int/

Michigan Left Turn - Describes how this unusual intersection feature works, including history.
http://www.michiganhighways.org/indepth/michigan_left.html

Images of Britain - Spaghetti Junction - The M6 at the A38(M) in Birmingham.
http://www.gayne.co.uk/iob/eng/wmids/ce00007.htm

WhereRoadsMeet - Includes aerial photographs and descriptions of unusual or complicated facilities in the United States.
http://whereroadsmeet.8k.com/